content/common/gpu/client/grcontext_for_webgraphicscontext3d.cc

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/common/gpu/client/grcontext_for_webgraphicscontext3d.h"
   6
   7 #include "base/lazy_instance.h"
   8 #include "base/trace_event/trace_event.h"
   9 #include "gpu/blink/webgraphicscontext3d_impl.h"
  10 #include "gpu/command_buffer/client/gles2_lib.h"
  11 #include "third_party/skia/include/gpu/GrContext.h"
  12 #include "third_party/skia/include/gpu/gl/GrGLInterface.h"
  13
  14 using gpu_blink::WebGraphicsContext3DImpl;
  15
  16 namespace content {
  17
  18 namespace {
  19
  20 // Singleton used to initialize and terminate the gles2 library.
  21 class GLES2Initializer {
  22  public:
  23   GLES2Initializer() { gles2::Initialize(); }
  24
  25   ~GLES2Initializer() { gles2::Terminate(); }
  26
  27  private:
  28   DISALLOW_COPY_AND_ASSIGN(GLES2Initializer);
  29 };
  30
  31 base::LazyInstance<GLES2Initializer> g_gles2_initializer =
  32     LAZY_INSTANCE_INITIALIZER;
  33
  34 void BindWebGraphicsContext3DGLContextCallback(const GrGLInterface* interface) {
  35   gles2::SetGLContext(reinterpret_cast<WebGraphicsContext3DImpl*>(
  36                           interface->fCallbackData)->GetGLInterface());
  37 }
  38
  39 }  // namespace anonymous
  40
  41 GrContextForWebGraphicsContext3D::GrContextForWebGraphicsContext3D(
  42     WebGraphicsContext3DImpl* context3d) {
  43   if (!context3d)
  44     return;
  45
  46   // Ensure the gles2 library is initialized first in a thread safe way.
  47   g_gles2_initializer.Get();
  48   gles2::SetGLContext(context3d->GetGLInterface());
  49   skia::RefPtr<GrGLInterface> interface = skia::AdoptRef(
  50       context3d->createGrGLInterface());
  51   if (!interface)
  52     return;
  53
  54   interface->fCallback = BindWebGraphicsContext3DGLContextCallback;
  55   interface->fCallbackData =
  56       reinterpret_cast<GrGLInterfaceCallbackData>(context3d);
  57
  58   gr_context_ = skia::AdoptRef(GrContext::Create(
  59       kOpenGL_GrBackend,
  60       reinterpret_cast<GrBackendContext>(interface.get())));
  61   if (gr_context_) {
  62     // The limit of the number of GPU resources we hold in the GrContext's
  63     // GPU cache.
  64     static const int kMaxGaneshResourceCacheCount = 2048;
  65     // The limit of the bytes allocated toward GPU resources in the GrContext's
  66     // GPU cache.
  67     static const size_t kMaxGaneshResourceCacheBytes = 96 * 1024 * 1024;
  68
  69     gr_context_->setResourceCacheLimits(kMaxGaneshResourceCacheCount,
  70                                         kMaxGaneshResourceCacheBytes);
  71   }
  72 }
  73
  74 GrContextForWebGraphicsContext3D::~GrContextForWebGraphicsContext3D() {
  75 }
  76
  77 void GrContextForWebGraphicsContext3D::OnLostContext() {
  78   if (gr_context_)
  79     gr_context_->abandonContext();
  80 }
  81
  82 void GrContextForWebGraphicsContext3D::FreeGpuResources() {
  83   if (gr_context_) {
  84     TRACE_EVENT_INSTANT0("gpu", "GrContext::freeGpuResources", \
  85         TRACE_EVENT_SCOPE_THREAD);
  86     gr_context_->freeGpuResources();
  87   }
  88 }
  89
  90 }  // namespace content